Holy Sacrament vs Holy Eucharist

Holy Sacrament and Holy Eucharist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Sacrament	Yes	No	No	No
Holy Eucharist	Yes	No	No	No

As nouns, Holy Sacrament and Holy Eucharist are synonyms defined as:

Holy Sacrament and Holy Eucharist: a Christian sacrament commemorating the Last Supper by consecrating bread and wine

Other synonyms of Holy Sacrament include Eucharist, Eucharistic liturgy, Liturgy, Lord's Supper, sacrament of the Eucharist.

Holy Sacrament (noun)	Holy Eucharist (noun)
a Christian sacrament commemorating the Last Supper by consecrating bread and wine	a Christian sacrament commemorating the Last Supper by consecrating bread and wine